A resolved CFD-DEM method is proposed to simulate the fluid-particle interaction for large complex granules. The airflow in a vertical sinter fixed bed is numerically studied using this method. The multi-sphere clumped method is used to create irregular sinter particles in DEM. The immersed boundary method and dynamic cell refinement are applied to describe the fluid flow around particles with higher resolution, by which the fluid-particle interaction can be simulated more accurately. The simulation results presented the packing voidage distributions and the airflow fields in the sinter beds of different single and mixed particle size ranges. The bed pressure drops were simulated and the results were compared with the corresponding experimental ones. The good agreement indicated that the proposed resolved CFD-DEM method is an effective tool to model the fluid-particle interaction for irregular large granules in the gas-solid multi-phase systems.

中文翻译：

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大型复杂颗粒的流体-颗粒相互作用的耦合模拟：用于模拟不规则烧结颗粒垂直固定床中气流的解析 CFD-DEM 方法

提出了一种解析的 CFD-DEM 方法来模拟大型复杂颗粒的流体-颗粒相互作用。利用该方法对立式烧结固定床中的气流进行了数值研究。多球聚集方法用于在 DEM 中创建不规则的烧结颗粒。采用浸入边界法和动态单元细化，以更高的分辨率描述颗粒周围的流体流动，从而可以更准确地模拟流体-颗粒相互作用。模拟结果显示了不同单一和混合粒度范围的烧结床中的填充空隙率分布和气流场。对床层压降进行了模拟，并将结果与​​相应的实验结果进行了比较。良好的一致性表明所提出的解析 CFD-DEM 方法是模拟气固多相系统中不规则大颗粒的流体-颗粒相互作用的有效工具。